605 citations · 2.3k across the 14 of their papers we have counts for
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Observation of exciton redshift-blueshift crossover in monolayer WS2
Edbert J. Sie, Alexander Steinhoff, Christopher Gies +10
We report a rare atom-like interaction between excitons in monolayer WS2, measured using ultrafast absorption spectroscopy. At increasing excitation density, the exciton resonance…
Large, valley-exclusive Bloch-Siegert shift in monolayer WS2
Edbert J. Sie, Chun Hung Lui, Yi-Hsien Lee +3
Coherent light-matter interaction can be used to manipulate the energy levels of atoms, molecules and solids. When light with frequency ω is detuned away from a resonance ωo, repul…
Observation of intervalley biexcitonic optical Stark effect in monolayer WS2
Edbert J. Sie, Chun Hung Lui, Yi-Hsien Lee +2
Coherent optical dressing of quantum materials offers technological advantages to control their electronic properties, such as the electronic valley degree of freedom in monolayer…
Valley-selective optical Stark effect in monolayer WS2
Edbert J. Sie, James W. McIver, Yi-Hsien Lee +3
Breaking space-time symmetries in two-dimensional crystals (2D) can dramatically influence their macroscopic electronic properties. Monolayer transition-metal dichalcogenides (TMDs…
Intervalley biexcitons and many-body effects in monolayer MoS2
Edbert J. Sie, Alex J. Frenzel, Yi-Hsien Lee +2
Interactions between two excitons can result in the formation of bound quasiparticles, known as biexcitons. Their properties are determined by the constituent excitons, with orbita…
Measurement of intrinsic Dirac fermion cooling on the surface of a topological insulator BiSe using time- and angle-resolved photoemission spectroscopy
Y. H. Wang, D. Hsieh, E. J. Sie +5
We perform time- and angle-resolved photoemission spectroscopy of a prototypical topological insulator BiSe to study the ultrafast dynamics of surface and bulk electrons af…